diff --git a/Wox/App.config b/Wox/App.config
index e1eb5518f..f376f313b 100644
--- a/Wox/App.config
+++ b/Wox/App.config
@@ -14,7 +14,12 @@
       </layout>
     </appender>
     <root>
+      <!-- ALL < DEBUG < INFO < WARN < ERROR < FATAL < OFF-->
+      <level value="WARN" />
       <appender-ref ref="LogFileAppender"/>
     </root>
   </log4net>
-<startup><supportedRuntime version="v2.0.50727"/></startup></configuration>
+  <startup>
+    <supportedRuntime version="v2.0.50727"/>
+  </startup>
+</configuration>
diff --git a/Wox/Helper/Log.cs b/Wox/Helper/Log.cs
index 656320f66..c23785d23 100644
--- a/Wox/Helper/Log.cs
+++ b/Wox/Helper/Log.cs
@@ -11,5 +11,25 @@ namespace Wox.Helper
         {
             fileLogger.Error(msg);
         }
+
+        public static void Debug(string msg)
+        {
+            fileLogger.Debug(msg);
+        }
+
+        public static void Info(string msg)
+        {
+            fileLogger.Info(msg);
+        }
+
+        public static void Warn(string msg)
+        {
+            fileLogger.Warn(msg);
+        }
+
+        public static void Fatal(string msg)
+        {
+            fileLogger.Fatal(msg);
+        }
     }
 }
diff --git a/Wox/MainWindow.xaml.cs b/Wox/MainWindow.xaml.cs
index 136ded6cc..dcdedb9ff 100644
--- a/Wox/MainWindow.xaml.cs
+++ b/Wox/MainWindow.xaml.cs
@@ -73,7 +73,7 @@ namespace Wox
 
             globalHotkey.hookedKeyboardCallback += KListener_hookedKeyboardCallback;
 
-            this.Closing += new System.ComponentModel.CancelEventHandler(MainWindow_Closing);
+            this.Closing += MainWindow_Closing;
         }
 
         void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
@@ -93,6 +93,8 @@ namespace Wox
             //DwmDropShadow.DropShadowToWindow(this);
 
             WindowIntelopHelper.DisableControlBox(this);
+
+            throw new Exception();
         }
 
         private void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
@@ -100,11 +102,15 @@ namespace Wox
             if (!System.Diagnostics.Debugger.IsAttached)
             {
                 string error = "Wox has an error that can't be handled. " + e.ExceptionObject;
-                Log.Error(error);
                 if (e.IsTerminating)
                 {
                     notifyIcon.Visible = false;
                     MessageBox.Show(error);
+                    Log.Fatal(error);
+                }
+                else
+                {
+                    Log.Error(error);
                 }
             }
         }
diff --git a/Wox/PluginLoader/BasePluginLoader.cs b/Wox/PluginLoader/BasePluginLoader.cs
index ab71816f6..a91e8b51a 100644
--- a/Wox/PluginLoader/BasePluginLoader.cs
+++ b/Wox/PluginLoader/BasePluginLoader.cs
@@ -71,7 +71,7 @@ namespace Wox.PluginLoader
 
             if (!File.Exists(configPath))
             {
-                Log.Error(string.Format("parse plugin {0} failed: didn't find config file.", configPath));
+                Log.Warn(string.Format("parse plugin {0} failed: didn't find config file.", configPath));
                 return null;
             }
 
@@ -84,7 +84,7 @@ namespace Wox.PluginLoader
             catch (Exception)
             {
                 string error = string.Format("Parse plugin config {0} failed: json format is not valid", configPath);
-                Log.Error(error);
+                Log.Warn(error);
 #if (DEBUG)
                 {
                     throw new WoxException(error);
@@ -98,7 +98,7 @@ namespace Wox.PluginLoader
             {
                 string error = string.Format("Parse plugin config {0} failed: invalid language {1}", configPath,
                     metadata.Language);
-                Log.Error(error);
+                Log.Warn(error);
 #if (DEBUG)
                 {
                     throw new WoxException(error);
@@ -110,7 +110,7 @@ namespace Wox.PluginLoader
             {
                 string error = string.Format("Parse plugin config {0} failed: ExecuteFile {1} didn't exist", configPath,
                     metadata.ExecuteFilePath);
-                Log.Error(error);
+                Log.Warn(error);
 #if (DEBUG)
                 {
                     throw new WoxException(error);
diff --git a/Wox/PluginLoader/CSharpPluginLoader.cs b/Wox/PluginLoader/CSharpPluginLoader.cs
index 520e407d3..9bcde2352 100644
--- a/Wox/PluginLoader/CSharpPluginLoader.cs
+++ b/Wox/PluginLoader/CSharpPluginLoader.cs
@@ -25,7 +25,7 @@ namespace Wox.PluginLoader
                     List<Type> types = asm.GetTypes().Where(o => o.IsClass && !o.IsAbstract && (o.BaseType == typeof(BaseSystemPlugin) || o.GetInterfaces().Contains(typeof(IPlugin)))).ToList();
                     if (types.Count == 0)
                     {
-                        Log.Error(string.Format("Cound't load plugin {0}: didn't find the class who implement IPlugin",
+                        Log.Warn(string.Format("Cound't load plugin {0}: didn't find the class who implement IPlugin",
                             metadata.Name));
                         continue;
                     }
diff --git a/Wox/PluginLoader/PythonPluginLoader.cs b/Wox/PluginLoader/PythonPluginLoader.cs
index 644b82fbd..e5bd223b3 100644
--- a/Wox/PluginLoader/PythonPluginLoader.cs
+++ b/Wox/PluginLoader/PythonPluginLoader.cs
@@ -39,7 +39,7 @@ namespace Wox.PluginLoader
                 PythonEngine.Shutdown();
             }
             catch {
-                Log.Error("Could't find python environment, all python plugins disabled.");
+                Log.Warn("Could't find python environment, all python plugins disabled.");
                 return false;
             }
             return true;